Quasi-Dual Formulation of Homogenized Integral Equation for Metasurfaces

The impedance boundary condition (IBC) is a well known and convenient approximation of metasurfaces. When used with the Integral Equation formulation (MoM) it leads to the Electric Field Integral Equation-IBC (EFIE-IBC) format. While very convenient, this formulation has conditioning issues when the surface impedance has inductive values. In this communication, we present an approximate formulation that employs the dual of the EFIE and the admittance; this formulation is shown to improve the conditioning problem of the EFIE-IBC.